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Its called layer or inter granular corrosion and only affects cetain aluminium grades If the grain structure has been flattened by extrusion then it is more pronounced Salt causes it 7000 series Al is badly affected by it esp 7075 which is also the strongest grade for forging My DRZ forks are affected....I painted them to seal the surface and it has stopped it from progressing completly

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If you want to make them colored again I guess you can take the forks off, than take them apart and have them re anodized or maybe have the Cerakoted in whatever color you want. Or you can also buy upper and lower fork covers and just cover them up. They make carbon fiber ones that look super nice and will be cheaper than having your forks re anodized. My forks are brushed aluminum with no coating on them and they still look brand new. Here is a link to the carbon upper fork and carbon lower fork covers